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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20231542b5fa2c4202f88491e73a412c64b23a207bee9b54f9254e1d18b1e76c' 
  AND token = 'eWL6WX6z3nz+Yh9PBTFgkz5SZvo+xazNyFCYmy9C8CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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