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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4393643794f6682726226bf757504a6aa0b47aad1fd5e4625dbbac88c3c79e2' 
  AND token = 'nG3QH5ByZfUOMStm2PD6KWBeYYWiGsSpCCwOoq5m4UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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