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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373895dbc3ba95f269279b6f219f9c7e4b4e4d93b1fe34735d6a24f5b00e3aab' 
  AND token = 'rvCL0N/L/y7WXqKdFqa6KjLI6khBKrfwo0ieb3gMLe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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