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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3196d36a4ba0e28a2b1382299d8668765dc73026aa9edd12ea393da2d9f08450' 
  AND token = 'AqwqC7vqzCBEysn2w8vYOGwzrJk4Hl3JHgikQe0zEEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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