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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b96da10d61acc28bfbe84e4b22e908246a9b02220541bff1da434de6066f6b3' 
  AND token = '1hczIJmPYC61uEaQ94IcXUGSUK5XDrrM3z/V06bZlBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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