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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccedc386b2947439aa92b97bb2f3ba0cccc926093e64c7a3b2a559fbc0990be' 
  AND token = 'WhsCEcqYg6w+8khFproDyV1OeZ8GtdZtJRFXvSNgm3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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