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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccfb8126478a9a4ff67c2cf7ed6516bed9c0d54de65acd85edb150478cbe49c' 
  AND token = 'oTRNNs3g+z1yYF5fF6bsIDDzgl08AcLgbeyB2iLqWOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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