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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253b5969f1fbb05c238a9bc5870a52c80052aabe8c738b061bfed2ed72cd19a0' 
  AND token = 'uHDHlnZPmxbsr1nefMytSYc6lrPuh8JScuhpV9jAgWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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