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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b7f7e805dc6c1d9f7770c5ced0a1c2830a9201fd83a1e9264fe4b313b37ee7' 
  AND token = 'aIWbaNOzBIe52ynCCdK/5eHX5CYZRSEKaxYpHjqe/fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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