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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069c281570d28bb34e14d500775c1f8d67b373f65e424a106e788b9d61f259ee' 
  AND token = '9RwqUNRNy9CjCUKWcd09zKNwZbGT5+/comTgCopz0ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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