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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7e76dc07ae7e91ff8882c6280eda3668d5f9070573e7f4e053ccb49961c9a7' 
  AND token = 'pOP3Ylu80GYfKERFipjr+KwrXNhYjLWDYlfbsVuryXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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