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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3595d529a873d52fd29ba154bdf2fd107366ca2515aa72d386c68dfb6b4afb' 
  AND token = 'I6P11NZ32pMAUqMSrfQSIofwaGa6BB6HF/ZhEujQGNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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