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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6764df5c12b4ec7fe093fae477f526f032dd504eb7aa304aefb6263341f20b' 
  AND token = 'kKZ02xbbsZKAYkTbFqb8M3o8N//msCFq1GSSyg2hbcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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