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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c370d3c0a2b33d946c8c9e9bed7f64aa59f42712c6091a45275c61e9f95f14' 
  AND token = 'e1n1mY85qmANSm8CT7ZORCpC/3yL/FxCIsheRcmzTIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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