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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531695a8876336a92e1376cee42243087e5fd13bfd963e4ba38316ee63474396' 
  AND token = '3SokE0k9dnnGg2Rgm5dSdEDZkEt9BVUywZ4o8c5EYFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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