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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8931fd50b0c7375725c472fcd02830be76b4129162f86693cca5588d233552ab' 
  AND token = '2nWOjOzlkkPlrX3jRzGCz3IdCyKP4Q59olxmOsnYSw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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