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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77cc307676e2489d6a90578c899964e51a8b56d8d0e11e6b5bc21da88f01a21' 
  AND token = 'daT2xm/VMucxQEoE9Asr8y4DhtF9qmYvplcswOdkwXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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