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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79af460e03664c159fba4b00fd89fccd3c4e9313fb0654084cdf851442fb00f2' 
  AND token = '+xffKc0hoZfs34cYb92tiGZgDrcSu0y2ECjg8ALyxVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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