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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae3ae5a3773d09b88e9d95df7eb165afb5a9944fad778ae8287c5da19794c7f' 
  AND token = 'iWG7pyyusLZigPozsCKe+lkqJV29INjDJuTnFcS0iD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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