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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c7529ab5e37fdc2bb225a15aa606c9fd6c093fc0c4450015ac264d81c6acb4' 
  AND token = '2FbcGZsQrPN9qzEl0qw4E5GO323n0yqQidbouJ86v0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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