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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebde9a6f62c5d25625b3ae7c3c0ca580c6b7d6c31ec0ec32749a7bd3393d35db' 
  AND token = '38IH+Yd7IAQDDrueF/4iVJK+GqTV7IwYn+w0TVnsxPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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