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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bade1df5f6f08ce5116cd96710797557919ebe660096e80a0943656a8c91c94c' 
  AND token = 'p6DdM10K5S/TW14CuqahhvqowQAM/I6BXm0e9tanwOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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