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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acb13279a004c4c37682b7f6dd4457f4e52c9ee7a73f1c49d48eb3e99f687fa' 
  AND token = '8aYxHWdMtAEdwW1DD/qzFqY24MFBQ5xSq0yEOgv2ltk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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