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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c25d04c8b73fa89ef3eb9b98ad36059092ecb2622134eed96fe6d5fc3ceebe' 
  AND token = 'f/LWdLY5el/1qGKUnNshWAAA2mTXP0USjOJX4OAD4lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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