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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a242a76713dd875d5fbd0ebf1507aff46b41a271a2c501f6dbe97bd20c40ced3' 
  AND token = 'dWm3wFWqs7638N2eIluSJna0zxru2HVbfvZZJ/PIuT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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