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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05548b169def17e2b972e0036cc40b870262e109fe03dd381d7d6ebbb7e7957' 
  AND token = 'lvUvLF+TWbGtBJBX2mJkFVzn6YdbPR9FnTeOwU39xBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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