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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf6a08da8b10f251ab6d81d44e307e9ee32fc3b0e40b3443fb82f6d64da6f43' 
  AND token = 'EZE3viriq6vx111zsK6ywP0I0AuuxZFGMmyyIYPs+xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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