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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b98b492c1bd7e96d0c9ff1354bd6a4a1b7bc0f8a1644545f64696939c28be5' 
  AND token = 'KbNCnvYz0TbhGCGtZso2s6DS82vTsVcJR0HLpa0jLv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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