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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1027cff6fad3a7209e49b937865223d4bf4ca47c203ece6629ed9e771b29270a' 
  AND token = 'Gi5x0v86nnvZ0sh3jMEu+8jiUgmaBkaThZtWP3lF6vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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