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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d94d867113aa07b00eb08de60b305db23f1b8c0e43b4fbc0e0dfd46546d316' 
  AND token = 'O5GbfvMT0eyUyvICH9wXTf/OxDXstq1ZkdxBftaYfSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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