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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6014fe1909c88e9c3829709d69b99dc08a6262dd9aa8ad7ed4394eae526d1f1e' 
  AND token = 'Se3TGmDU/wYRv2Wogy74mone0FA2E6OZJzyCSkzfz40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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