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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb3c7bdbfbdc76f9b705791c331a91141fc7c53c0b2281a3608294ceb086977' 
  AND token = 'NkQVL0PZbq8rC1+M7rjh4tKCIrZZUlV5Wj3Fl1BEXA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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