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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e468c3a89a8b457a98b77559c9a77225ab9fbb26bf8f8d75019aac43561166d8' 
  AND token = '11mNKtVnh7f50zHKi6PKJp8AUDCtEdYRM3SGVwKfAZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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