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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c113079665f565e8c53789a8e35f77ed9026ffc3af512219d95c6fe9d1550dff' 
  AND token = 'c5rDKkRpRJxdBxnSqWe/s+OM+l9T5/jeTLsOw8goX6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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