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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fefb9d9484ead7b93fd80365b2980dce47d85c75625933fe4809332e4711368' 
  AND token = '5LcXb1W4CUCKZ/rRWZxxaWu9rZqZ/4XraiDATjh31KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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