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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ac9cc1d1d66f098222c74a9430a8d93e91505dd708f909515079e25e71abd5' 
  AND token = 'OHIHn7TybeDb0hbkdhG5CZTieY8Zh1BUTs7I6Po16/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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