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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c9e0bb30438791f0ff8062ec1d1fe2fdfb5cf241d4ae7dc5b19c3764c9fab5' 
  AND token = 'mfd/KBg7L0c8iEGePLdbpOKo3PaJRiToHqf/6MKfA/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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