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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1d0ac093b80a557ad39003f4632342abdc7535f36786cd50824850477f2609' 
  AND token = 'rfAVgviab500WLa0Mt3EcszGPiNceUwL7t/oPWW+Xvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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