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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c583584c75018f78d79017aafa97f40d10f637bffd32033dae0ac565e0992c72' 
  AND token = 'cT6osvrSOUDMiJ+NnjhMI5V8GZHUb1Q7oCgpWafcNjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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