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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320fea66e68a0ba5546209b89c41cc7fe198ce63530615a5bb26e9f07290207e' 
  AND token = '6sV/GtPsVudotfx8DEVYEiiorFAVK5RgxA5suSuIXW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}