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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42bdcaf74790a78570147f919c4249a25eb01422530626d6906aba0ec53c701' 
  AND token = 'SWwKvBC+y1ekdLnjM5TI+eEvhEWjJhTJm/r2OUThTdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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