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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc9a9cb8942293ea4d4157e7d280ce90fe295240490a2e3138eb3014942a2bb' 
  AND token = 'mGz/qlE5vfdSPKlXhq81uGKmSVHKmGseOJ4eCGh5s04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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