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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9c8413b7a3baf9d9140d43c9e79f92b3ff4b052eae01168b99aa6cabf63b40' 
  AND token = 'YpPsYUnd7aoKjTz7mEH0kVZjnCEqmALGYsDa+YWIquM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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