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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dba065a80842eca51458373738dced641c866c10bb6beb5fc4cd37cb9a2941' 
  AND token = '13/lPiJda/eV73b6yrYfE6sLVFmQOdMcS3onyE/N1r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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