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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a36986f823a496e2d76616dd99e07551599511c078908c62864b9b9c28e331' 
  AND token = '+SNdt9t+ee1UAG59k3bDWYun0C7S8rZDTW8V0EWopr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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