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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e47fa32173cc29895680c3afe47523899c07941892eca5abaa523b5304f196e' 
  AND token = 'rtm3JUtv7gKHasU68Sbr8+5TfXSvaMitvv3HA/Yv/CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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