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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5812981a172b1b8c27ebae2584d96cfdfd35878cf04b8d227b949ed43f408a' 
  AND token = '+RdI8/l0S974dMfZp8KyWoXrIN0JW8o9/bBY5pdZW1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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