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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0a66608742221fe9f728d57c4f0c2b22e2ee28c26b25941f3feca7a52f487c' 
  AND token = '8Llt4O0sw4yarxXbd/sUtxiSdHCLthB95TGz+RvNzd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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