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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b78c292efd8fa9d4deb7b95ca2f6b858b2043741b46648c6574e25ae6567ac' 
  AND token = 'pTw/uSFXl2ZDdP/W3MZcSxWrIMmsp/CpcxKxB1Ir6Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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