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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb1ccd83f5ce1a40faa3a9af5447c4272c08cd0e4574c99c0aa78af393fe88b' 
  AND token = '2KwNTG8CnLGIxYmHZTZqV6uNJyVMcLDeqBbsgcZcM0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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