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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afbe56ff85923217247b4320c70bced4cca11ad27a543bac45cc309e118938d' 
  AND token = 'nWmFJde2WlYUVFkm8VYhf61L6SfWt/y1lf657NjVwqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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