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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd02102074440b2422f0e5b30e651e8815d370898b344545e2221140f04f1833' 
  AND token = '/uY6lCC5dKZlV0RBWeWUITOG6fphJJOoohl6iyDglnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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