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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7d072be92630f9d3c5bae76fdcb207d37995828030d39083bd89c00511df50' 
  AND token = 'VXE8umKTWe+yMIeRfX13WcAe7Jrz4asa8At4qr+9hi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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