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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9714e2da0509baa895141be24ad72b6181a8fb017cfea5f3fabbc48ba98871' 
  AND token = 'A/QZKJvEqil5F+S1156Hg7lXNwF1OW7pVDHdeS9XZCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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