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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebaed8a23bd10c50797170939eb182947ffe5ef0d0d7d0c11a8be7c5d9197aa9' 
  AND token = 'PaaWb8LH8+uEp1LynGKF0+S38c8MYQoRcAi4+2SuRnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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