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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b5e412910572c711d7559a6d2f496fd4e873dd6db5f86ec4bf8f3cc1c1ebb8' 
  AND token = 'vovQaJ6qn1eujEMWkn0j6s3vWVDnTaufhBsHfNs3054=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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