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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cceadad81a3c4f2d48c93a7fa06aa163b42ab880d64a51136a6f5bf45e16410' 
  AND token = '6e2sYAabvwT7Rn8J5ozKXZyTbwT/d7sROle699ntPr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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