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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825f26dff9c2c70d508a5a57625ad464031fa07de4fdfc6fd2c6c5ce4e44ce47' 
  AND token = 'PcodtfyvlmRZ9CSHmdT/97ZLvBGHtxY4KpP9FlX2uKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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