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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67eb961d4081a531d7030af416cd7fef6285acaf2449b4163832c481de104c8a' 
  AND token = '8AGE7rU43fLjhYJEzl1Wc8MBat76mXE4wQLfbwX2/Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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