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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2d75a259f64ef974cda0fadc060fb54e2ad8abb86dcce31814d3a678f7cfd7' 
  AND token = '+WOFLyU9n2IaFJz8ecg6eCuNYRUaNj3T/3yyTxns4wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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