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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e90eb1b6b1812c992a9b4e78e0993574673240893128f7e7b83e3dd621a92b' 
  AND token = 'jC2VZzpCOe5ixS0VD7yPYE8zdX/HpylXkSvkvxV49O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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