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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4a58d8125188a8c9b9271296cdf1d392b27e1653768ca4d7f817998790ae0b' 
  AND token = 'x6JaD/c00TPz+T48/b1WqfSsRwYIITfcHzIByPVmR1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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