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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd2d72b9ee14a88bb893d4d364fb237e336655c520aac82f551c89cec8d15e6' 
  AND token = '881apKOZ/SxPp1+l4B6z4Kqm4oeyLdG6We6Cirrlo4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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