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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416b0b006ad3a9c9b7b4981b0c71ffb14e74eba9ec27bd87401c99a74f05b08a' 
  AND token = '55x2peKqB6GaCjpFzbMNtG/nUKYvqUJHG5cEn22LpzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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