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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9038ddc54c3698da98bf78b486e87758676f0af642c48ec637220cf94f2c048' 
  AND token = '65687731dSnYc1lLS49tp5ly00bJNMT+B9tRE1TuR7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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